exports.getUsername = async (req, res, next) => {
    try {

        //处理请求
        res.send('get /profiles/:username')

    } catch (error) {
        next(error)
    }
}

exports.follow = async (req, res, next) => {
    try {

        //处理请求
        res.send('post /:username/follow')

    } catch (error) {
        next(error)
    }
}

exports.cancelFollow = async (req, res, next) => {
    try {

        //处理请求
        res.send('delete /:username/follow')

    } catch (error) {
        next(error)
    }
}